And the Cobb Tuning WRX went to Nationals back in 2002 or 2003 and spent llike $100,000 on their WRX and didn't win.
But if you swap your engine from the same manufacturer (Honda/Acura, Toyota/Lexus, Infinity/Nissan, etc) and you have 4 factory seats, you go to SM unless it's the exact same engine that came in your car from factory ie: D16Z=D16Z, B16A=B16A.
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